| 伊拉克M油田白垩系Mishrif组层序构型及储层展布 |
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| 引用本文： | 李峰峰,郭睿,刘立峰,余义常,宋世琦.伊拉克M油田白垩系Mishrif组层序构型及储层展布[J].沉积学报,2020,38(4):838-850. |
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| 作者姓名： | 李峰峰 郭睿 刘立峰 余义常 宋世琦 |
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| 作者单位： | 1.中国石油勘探开发研究院，北京 100083 |
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| 基金项目： | 国家科技重大专项2017ZX05030?001 |
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| 摘 要： | 为明确伊拉克M油田白垩系Mishrif组碳酸盐岩储层展布规律及控制因素，基于岩芯、测井和铸体薄片资料，在三级层序地层格架的控制下，通过岩相分析识别碳酸盐岩地层暴露面、岩性转换面和最大海泛面，将Mishrif组划分为6个四级层序（SQ1~SQ6）。结果表明:研究区发育浅滩暴露型、局限环境暴露型、浅滩非暴露型和长期暴露风化型4种层序构型，每种层序的沉积环境，体系域类型、层序界面特征、暴露时间及对储层的控制等存在差异。浅滩暴露型层序高位体系域晚期发育厚壳蛤滩、生屑滩及滩前等高能沉积型储层；局限环境暴露型层序界面以薄层炭质泥岩为特征，主要发育台内滩储集层，高位体系域顶部致密胶结带可作为物性隔层；浅滩非暴露型层序界面为岩性转换面，高位体系域发育潮道和生屑滩等高能沉积储层；长期暴露风化型层序高位体系域发育生屑滩储层，低位体系域形成的风化角砾岩带可作为良好的物性隔挡层。在深水沉积环境和潟湖沉积环境中，与生物扰动作用相伴生的白云化作用有效地改善沉积物的结构组分，形成了多套薄层低能成岩型储集层。
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| 关 键 词： | Mishrif组 碳酸盐岩 层序构型 体系域 生物扰动 |
| 收稿时间： | 2019-05-05 |
Sequence Architecture and Reservoir Distribution of the Cretaceous Mishrif Formation in M Oilfield,Iraq |
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| Institution: | 1.Research Institute of Petroleum Exploration & Development, Beijing 100083, China2.China National Oil and Gas Exploration and Development Company Ltd. , Beijing 100034, China3.College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China |
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| Abstract: | In order to clarify the distribution rules and control factors of the Cretaceous Mishrif Formation carbonate reservoir in M oilfield, Iraq, based on the core, logging, and cast thin sections, lithofacies analysis was carried out under the control of the regional third?order sequence. The Mishrif Formation was divided into six quaternary sequences (SQ1?SQ6) by identifying the exposed interface of the carbonate rock, the lithologic transition surface, and the maximum flooding surface. The result shows that there were four types of sequences: the exposure of the restricted platform, the exposure of the shoal, the non?exposure of the shoal, and the long weathering and erosion. Different sequences had different sedimentary environments, system tracts, sequence boundaries, and exposure times. The exposure of the shoal developed high?energy sediments, such as the rudist shoal, bioclastic shoal, and front shoal in the high system tract. The exposure boundary of the restricted platform was characterized by the formation of thin carbonaceous mudstone. The spot shoal located mainly in the high system tract and the dense cemented layer formed in the late stage of the high system tract could be used as a good barrier. The sequence boundary for the non?exposure of the shoal was the lithological transition surface, and the reservoir mainly formed in the tidal channel and the bioclastic shoal in the high system tract. The long weathering and erosion developed bioclastic shoal in the high system tract, and the weathered breccia zone in the low system tract could be the high?quality barrier. In addition, the dolomitization associated with the bioturbation effectively improved the properties of sediments in the lagoon of the transgressive system tract, forming a number of thin reservoirs. |
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